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After panda & penguin I would suggest to do these activities handle with care.

Social Bookmarking, Directory & article submission should be with the relevancy.
Forum posting & commenting is important, but again how you used it!
Blog commenting is also one of the useful, but how it's being used as well as relevance is also one of the most important.

Directory submission with relevancy is one of the most important. Guest blogging is important, but again relevancy & low guest blogging counting as a negative ranking.

The most popular and effective off page optimization methods are forum posting and blog commenting, majority of forums are dofollow so it will give quick results.

Thanks for your nice information .
Here i mentioned some of the best off page optimization technique :
1) Article creation and submission
2) Blog creation and submission.
3)E-book creation and submission.
4)Directory submission
You can visit this site Tucktail.com get the search engine visiblity service this service do many offpage promotion techniques like directory submission,search engine submission etc.. So your website or blog page rank and traffic will increase soon .

1.Social bookmarking is the best off page techniques for your content marketing.
2.For link building, participated in forums, guest post and answering questions.
3.Participate in social networking to get more traffic on your website.

I would like suggest to do submissions like PR, Guest Post, Article, Blog Commenting, Social Media Sites with high quality Contents..Automatically it will improve your traffic and also keyword rankings in SERP Reults.